MANUAL OF THE GRASSES OF THE WEST INDIES 339 
5. Setaria lutescens (Weigel) F. T. Hubb., Rhodora 18: 232. 1916. 
YELLOW BRISTLEGRASS. 
Panicum lutescens Weigel, Obs. Bot. 20. 1772. Germany. 
Chaetochloa lutescens Stuntz, U. S. Dept. Agr., Bur. Plant Indus. 
Inventory Seeds 31: 36, 86. 1914. 
This species has been commonly known as Panicum glaucum, 
Setaria glauca, and Chaetochloa glauca. However, Panicum glaucum 
of Linnaeus should apply to the species usually known as Pennisetum 
typhoideum L. Rich. or Penicillaria spicata Willd., commonly called 
in the United States pearl millet.** The following synonyms are 
based on Panicum glaucum L. as to name but refer to Setaria lutescens 
as to plant. 
Setaria glauca Beauv., Ess. Agrost. 51, 169, 178. 1812. 
Chamaeraphis glauca Kuntze, Rev. Gen. Pl. 2: 767. 1891. 
Izophorus glaucus Nash, Bull. Torrey Bot. Club 22: 423. 1895. 
Chaetochloa glauca Scribn., U. S. Dept. Agr., Div. Agrost. Bull. 4: 
29. 1897. 
Erect annual, often much branched at base, the culms becoming 
geniculate below or in open ground spreading or even prostrate- 
spreading; culms rather succulent below, 25 to 50 cm tall (in the West 
Indies); sheaths smooth, compressed-keeled; blades flat, 5 to 20 em 
long, 4 to 7 mm wide, scabrous on the upper surface, glabrous beneath; 
panicles dense, nearly cylindric, spikelike, yellow at maturity, mostly 
2 to 8 cm long, almost 1 cm thick (ineluding the bristles); bristles 
antrorsely scabrous, yellow, the longer ones 2 to 3 times as long as 
the spikelet; spikelets about 3 mm long, strongly convex on one side; 
fertile floret marked with numerous transverse ridges (fig. 309). 
A common weed in cultivated soil and waste places in the eastern 
United States, rare in the Tropics; introduced from Europe. 
JAMAICA: Cinchona, Hart 740; Hitchcock 9702; Harris 11272, 
11457. Resource, Perkins 1141. 
Harti: Pétionville, Ekman H 3233, H 10027. Kenskoff Mountain, 
Buch 1452. Furey, Leonard 4388, 4394, 4424, 4452. 
6. Setaria geniculata (Lam.) Beauv., Ess. Agrost. 51, 178. 1812. 
KNOTROOT BRISTLEGRASS. 
Pamcum genculatum Lam., Encycl. 4: 727 (err. typ. 737). 1798. 
Guadeloupe. 
Cenchrus parviflorus Poir., in Lam., Encycl. 6:52. 1804. Puerto 
Rico. 
Panicum imberbe Poir., in Lam., Encycl. Sup. 4: 272. 1816. North 
America and Brazil. 
Setaria berteroniana Schult., Mant. 2: 276. 1824. Santo Domingo. 
Setaria ventenati Kunth, Rév. Gram. 1: 251. pl. 37. 1830. Puerto 
Rico. 
Setaria glauca var. imberbis Griseb., Fl. Brit. W. Ind. 554. 1864. 
Chaetochloa geniculata Millsp. and Chase, Field Mus. Bot. 3: 37. 
1903. 
These names have been referred to Panicum, Setaria, Chaetochloa, 
and Chamaeraphis.™ 
34 Ere UEDeE discussion see Chase, Amer. Jour. Bot. 8: 41. 1921; and Contrib. U. S. Natl. Herb. 22: 
216 
85 For full synonymy see Hitchcock, U.S. Dept. Agr., Mise. Pub. 200: 943. 1935. 
